diff --git a/src/main.cpp b/src/main.cpp
index 4b6af77..b183774 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -189,7 +189,7 @@ int perfromOperation(int operation, char** fileNames, const Config& config)
 		RemapMap map;
 		map.outputCellSize = 50;
 		createRemapMap(inImages[0], map, points, config.verbose);
-		saveRemapMap(map, fileNames[0]);
+		saveRemapMap(map, std::string(fileNames[0]) + ".mat");
 	}
 	else if(operation == APPLY_MAP)
 	{